Helmet attachment



FIG. 1 is a top, rear, right side perspective view of a helmet attachment showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The dot-dash broken lines shown in FIGS. 1, 2, 4 and 6-7 define boundaries of the claimed design and form no part thereof. All other broken lines shown in FIGS. 1-7 represent unclaimed portions of the helmet attachment and form no part of the claimed design. 

CLAIM The ornamental design for a helmet attachment, as shown and described. 